masjo

I changed the code sidebar.php to this and now it works.

<!-- sidebar -->
<aside id="sidebar" role="complementary">
    <?php do_action( 'before_sidebar' ); ?>
    <?php if(!function_exists('dynamic_sidebar') || !dynamic_sidebar('main-sidebar')) : ?>
    	<div id="archives" class="widget">
			<h3 class="widget-title"><?php _e( 'Archives', 'corpo' ); ?></h3>
			<ul class="list arrow">
				<?php wp_get_archives( array( 'type' => 'monthly' ) ); ?>

		</div>

		<div id="meta" class="widget">
			<h3 class="widget-title"><?php _e( 'Meta', 'corpo' ); ?></h3>

<ul>
				<?php wp_register(); ?>
				<?php wp_meta(); ?>
			</ul>
		</div>
    <?php endif; ?>

</aside>
<!-- /sidebar -->

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